How to Compliment people and how to express care or sympathy?

compliment :
you look beautuful in that dress.
you have a very good taste.

sympathy :
i'm sorry.
my condolences.

dengan menggunakan : (compliments, ini yang formal)
that's a very nice...
you are looking axtremely...
I must compliment to you on...
May I say how elegant you look?

Expressing : (ini yang formal)
Thanks 
Do you think so?
Oh, it was nothing
thank you for the compliment

Sympathy :
You must be very upset
I was deeply
I know how its feel
Iam sorry to hear that